Custom auto-lock bottom carton for egg tarts: barrier film inside, a paper tray that doubles capacity
Why
An egg tart goes into the box hot. Steam softens plain card within minutes, so the inside of the box is lined with a protective film that keeps the carton crisp and the tart as it left the oven. The auto-lock bottom pops open in one motion at the counter, and a paper tray inside holds a second layer, so one box carries twice the tarts.
For your product
Anything served warm or oily, tarts, pastries, fried snacks, needs a barrier layer, not just thicker card. Ask for the film or a food-grade coating at quote stage; it changes the price less than a reprint does.











